Effects of Precursor Concentration in Solvent and Nanomaterials Room Temperature Aging on the Growth Morphology and Surface Characteristics of Ni–NiO Nanocatalysts Produced by Dendrites Combustion during SCS

Abstract

The morphology and surface characteristics of SCS(Solution Combustion Synthesis)-derived Ni–NiO nanocatalysts were studied. The ΤΕΜ results highlighted that the nanomaterial’s microstructure was modified by changing the reactants’ concentrations. The dendrites’ growth conditions were the main factors responsible for the observed changes in the nanomaterials’ crystallite size. Infrared camera measurements demonstrated a new type of combustion through dendrites. The XPS analysis revealed that the NiO structure resulted in the bridging of the oxygen structure that acted as an inhibitor of hydrogen adsorption on the catalytic surface and, consequently, the activity reduction. The RF-IGC indicated three different kinds of active sites with different energies of adsorption on the fresh catalyst and only one type on the aged catalyst. Aging of the nanomaterial was associated with changes in the microstructure of its surface by a gradual change in the chemical composition of the active centers.

Dry Reforming of Methane over Ni–Fe–Al Catalysts Prepared by Solution Combustion Synthesis

“…18 It should be mentioned that the catalyst prepared via SCS can be active in DRM due to its small particle size, thereby increasing its catalytic activity. 19 Catalysts derived by SCS are divided into two groups, such as bulk and supported. The first group of catalysts comprises powders or foam-like aggregates used in various catalytic reactions.…”

“…In addition to catalysts, several other types of materials, such as semiconductors, bioceramics, luminescent nanospheres, and various types of nanosized oxides, can be synthesized . It should be mentioned that the catalyst prepared via SCS can be active in DRM due to its small particle size, thereby increasing its catalytic activity …”

The Synthesis Methodology of PEGylated Fe3O4@Ag Nanoparticles Supported by Their Physicochemical Evaluation

“…Nanotechnology is a field dealing with the synthesis of various structures having at least a size within the range 1–100 nm and is one of the most rapidly developing sciences [ 1 ]. Nanomaterials find applications in such areas as food packaging [ 2 ], the electric industry [ 3 , 4 ], or catalysts [ 5 , 6 ]. Nonetheless, particular interest in nano-sized materials is currently observed in medicine and the related areas, i.e., in orthopedy [ 7 ], dentistry [ 8 , 9 ], or in drug delivery [ 10 , 11 , 12 ].…”

New Solvent-Free Melting-Assisted Preparation of Energetic Compound of Nickel with Imidazole for Combustion Synthesis of Ni-Based Materials

“…The literature shows that the water remaining in the gel precursor after evaporation of the solution of reagents and the conditions of preliminary drying of the precursor have a significant effect on its combustion process and the phase composition of the resulting products [9,13,22,23]. The presence of water in the composition of the precursor leads to a decrease in the temperature of the reaction zone due to heat consumption on evaporation of water and heating of the resulting vapors [22,24,25].…”